Dog Names That Start With O

98 names More name lists Checked 9 Oct 2026

These dog names that start with O come from real dogs: 98 different names starting with O, shared by 6,331 licensed dogs in New York City records. The most popular come first, then girl and boy dog names, unisex picks, short names and rare ones.

Oliver leads the O page with over a thousand dogs, and its short form Ollie is second. There are 98 O names, and the top ten are mostly male.

Otis, Otto and Oscar are classic, friendly picks, and Otto reads the same backwards. Onyx suits a black coat, while Olive and Opal are lovely options for female dogs. Oso and Osito mean bear and little bear in Spanish. Orion, Ocean and Oslo bring in stars, sea and city.

Dog names starting with O: 98
Most popular: Oliver 1,213 dogs
Top girl name: Olive
Top boy name: Oliver

Most popular dog names that start with O

#	Name	Dogs	Mostly
1	Oliver	1,213	boy
2	Ollie	726	boy
3	Oscar	666	boy
4	Olive	613	girl
5	Otis	429	boy
6	Onyx	265	boy
7	Otto	258	boy
8	Ozzy	243	boy
9	Olivia	213	girl
10	Ozzie	136	boy
11	Oakley	127	boy
12	Oso	118	boy
13	Opie	74	boy
14	Opal	65	girl
15	Ophelia	60	girl
16	Owen	60	boy
17	Osito	55	boy
18	Orion	53	boy
19	Ocean	51	both
20	Oslo	45	boy
21	Oskar	35	boy
22	Ortiz	31	both
23	Obie	29	boy
24	Oatmeal	27	boy
25	Oona	25	girl
26	Otter	24	both
27	Oz	24	boy
28	Oberon	22	boy
29	Omar	21	boy
30	Oswald	21	boy
31	Olly	20	boy
32	Odysseus	17	boy
33	Oli	17	both
34	Osita	17	girl
35	Oden	16	boy
36	Omega	16	boy
37	Ori	16	both
38	Osa	16	girl
39	Oddie	14	boy
40	Olympia	14	girl
41	Oak	13	boy
42	Octavia	13	girl
43	Orson	13	boy
44	Onix	12	boy
45	Optimus	12	boy
46	Orla	12	girl
47	Osiris	12	boy
48	October	11	both
49	Orlando	11	boy
50	Othello	11	boy
51	Okami	10	both
52	Olga	10	girl
53	Orbit	10	boy
54	Ocho	9	boy
55	Odette	9	girl
56	Oxford	9	boy
57	Oliva	8	girl
58	Orange	8	boy
59	Orie	8	both
60	Orio	8	boy

Girl dog names that start with O

Olive
Olivia
Opal
Ophelia
Oona
Osita
Osa
Olympia
Octavia
Orla
Olga
Odette
Oliva
Odessa
Ohana
Orchid
Orea
Ofelia
Orly

Boy dog names that start with O

Oliver
Ollie
Oscar
Otis
Onyx
Otto
Ozzy
Ozzie
Oakley
Oso
Opie
Owen
Osito
Orion
Oslo
Oskar
Obie
Oatmeal
Oz
Oberon
Omar
Oswald
Olly
Odysseus
Oden
Omega
Oddie
Oak
Orson
Onix
Optimus
Osiris
Orlando
Othello
Orbit
Ocho
Oxford
Orange
Orio
Otie

Unisex dog names with O

Ocean
Ortiz

Short dog names that start with O

Four letters or fewer: easy to call at the park.

Otis
Onyx
Otto
Ozzy
Oso
Opie
Opal
Owen
Oslo
Obie
Oona
Oz
Omar
Olly
Oli
Oden
Ori
Osa
Oak
Onix
Orla
Olga
Ocho
Orie
Orio
Orzo
Otie
Ody
Okie
Orea

Unique dog names that start with O

Real names given to only a handful of dogs.

Oona
Otter
Oz
Oberon
Omar
Oswald
Olly
Odysseus
Oli
Osita
Oden
Omega
Ori
Osa
Oddie
Olympia
Oak
Octavia
Orson
Onix
Optimus
Orla
Osiris
October
Orlando
Othello
Okami
Olga
Orbit
Ocho
Odette
Oxford
Oliva
Orange
Orie
Orio

Filter all 98 dog names that start with O

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Questions people ask

What is the most popular dog name that starts with O?

Oliver, given to 1,213 licensed dogs in New York City records.

What are good girl dog names that start with O?

Olive, Olivia, Opal, Ophelia, Oona, Osita, Osa, Olympia.

What are good boy dog names that start with O?

Oliver, Ollie, Oscar, Otis, Onyx, Otto, Ozzy, Ozzie.

What are unique dog names that start with O?

Oona, Otter, Oz, Oberon, Omar, Oswald, Olly, Odysseus were each given to only a few dogs.

Source: New York City dog licensing records (the open nycdogs dataset), with each licensed dog counted once. "Girl" or "boy" shows whether most dogs with the name were female or male. Brand, character and celebrity names are left out.

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